Welsh Rarebit with Spinach

Welsh Rarebit with Spinach was pinched from <a href="http://food52.com/recipes/4506-welsh-rarebit-with-spinach" target="_blank">food52.com.</a>
4 slices of good, sturdy bread (i used a very nice gluten free flax seed bread by glutino - any will do, but please, no wonderbread!)
1 cup of grated cheddar cheese (I used Denhay English cheddar)
1/2 teaspoon of Colman's mustard powder (or 1 teaspoon of a milder mustard)
1/2 teaspoon worcestershire sauce
a little ground black pepper
dash of milk (probably about a teaspoon)
2 cups of fresh spinach or 1/2 cup frozen.
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